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Finding the Fourth Proportional to 8,139.88, 12,210.80 and 2,873.80

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Solution

The fourth proportional to 8,139.88, 12,210.80 and 2,873.80 is: 4,311.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,139.88 : 12,210.80 = 2,873.80 : x
  2. Step 2: Convert to fraction form
    8,139.88/12,210.80 = 2,873.80/x
  3. Step 3: Cross multiply
    8,139.88x = 12,210.80 × 2,873.80
  4. Step 4: Simplify right side
    8,139.88x = 35,091,397.04
  5. Step 5: Solve for x
    x = 35,091,397.04/8,139.88
  6. Step 6: Final answer
    x = 4,311.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.